Makgopa, KRaju, KumarEjikeme, PMOzoemena, Kenneth I2019-03-262019-03-262017-06Makgopa, K. et al. 2017. High-performance Mn3O4/onion-like carbon (OLC) nanohybrid pseudocapacitor: Unravelling the intrinsic properties of OLC against other carbon supports. Carbon, vol. 117: 20-320008-62231873-3891https://www.sciencedirect.com/science/article/pii/S0008622317301793http://dx.doi.org/10.1016/j.carbon.2017.02.050http://hdl.handle.net/10204/10861Copyright: 2017 Elsevier. Due to copyright restrictions, the attached PDF file only contains the abstract of the full text item. For access to the full text item, please consult the publisher's website. The definitive version of the work is published at http://dx.doi.org/10.1016/j.carbon.2017.02.050The electrochemical performance of the tetragonal hausmannite Mn3O4, when embedded on various carbon materials, onion-like carbon (OLC), carbon nanotubes (CNT), reduced graphene oxide (RGO) and activated carbon (AC) (i.e., OLC/Mn3O4, CNT/Mn3O4, GO/Mn3O4, and AC/Mn3O4), has been investigated as electrode material for symmetric and asymmetric pseudocapacitor device. The nanohybrid electrode materials demonstrated higher electrochemical performance (in terms of specific capacitance and rate capability as energy storage devices) compared to the pure Mn3O4. The OLC/Mn3O4-based symmetric pseudocapacitor device exhibited higher specific capacitance of 195 F g-1, specific energy of 4.3 Wh kg-1 and power density of 52 kW kg-1 compared to other carbon nanohybrid materials studied. From the symmetric experiments, the best-performing OLC/Mn3O4 nanohybrid has been further explored as high-voltage asymmetric pseudocapacitor, with maximum energy and power densities of ca. 19 Wh kg-1 (at 0.1 A g-1) and 45 kW kg-1 (at 10 A g-1) respectively. The high-performance of the OLC-based system compared to the other carbon systems is ascribed to the combined unique intrinsic properties of the OLC; high electrical conductivity, highly accessible outer surface and large interparticle pore volumes. The above properties have ensured OLC/Mn3O4 nanohybrid as a suitable candidate for the high-voltage asymmetric pseudocapacitor device.enOnion-like carbonsOLCPseudocapacitorElectrolytic manganese dioxideEMDTetragonal hausmannite Mn3O4ArticleMakgopa, K., Raju, K., Ejikeme, P., & Ozoemena, K. I. (2017). High-performance Mn3O4/onion-like carbon (OLC) nanohybrid pseudocapacitor: Unravelling the intrinsic properties of OLC against other carbon supports. http://hdl.handle.net/10204/10861Makgopa, K, Kumar Raju, PM Ejikeme, and Kenneth I Ozoemena "High-performance Mn3O4/onion-like carbon (OLC) nanohybrid pseudocapacitor: Unravelling the intrinsic properties of OLC against other carbon supports." (2017) http://hdl.handle.net/10204/10861Makgopa K, Raju K, Ejikeme P, Ozoemena KI. High-performance Mn3O4/onion-like carbon (OLC) nanohybrid pseudocapacitor: Unravelling the intrinsic properties of OLC against other carbon supports. 2017; http://hdl.handle.net/10204/10861.TY - Article AU - Makgopa, K AU - Raju, Kumar AU - Ejikeme, PM AU - Ozoemena, Kenneth I AB - The electrochemical performance of the tetragonal hausmannite Mn3O4, when embedded on various carbon materials, onion-like carbon (OLC), carbon nanotubes (CNT), reduced graphene oxide (RGO) and activated carbon (AC) (i.e., OLC/Mn3O4, CNT/Mn3O4, GO/Mn3O4, and AC/Mn3O4), has been investigated as electrode material for symmetric and asymmetric pseudocapacitor device. The nanohybrid electrode materials demonstrated higher electrochemical performance (in terms of specific capacitance and rate capability as energy storage devices) compared to the pure Mn3O4. The OLC/Mn3O4-based symmetric pseudocapacitor device exhibited higher specific capacitance of 195 F g-1, specific energy of 4.3 Wh kg-1 and power density of 52 kW kg-1 compared to other carbon nanohybrid materials studied. From the symmetric experiments, the best-performing OLC/Mn3O4 nanohybrid has been further explored as high-voltage asymmetric pseudocapacitor, with maximum energy and power densities of ca. 19 Wh kg-1 (at 0.1 A g-1) and 45 kW kg-1 (at 10 A g-1) respectively. The high-performance of the OLC-based system compared to the other carbon systems is ascribed to the combined unique intrinsic properties of the OLC; high electrical conductivity, highly accessible outer surface and large interparticle pore volumes. The above properties have ensured OLC/Mn3O4 nanohybrid as a suitable candidate for the high-voltage asymmetric pseudocapacitor device. DA - 2017-06 DB - ResearchSpace DO - 10.1016/j.carbon.2017.02.050 DP - CSIR KW - Onion-like carbons KW - OLC KW - Pseudocapacitor KW - Electrolytic manganese dioxide KW - EMD KW - Tetragonal hausmannite Mn3O4 LK - https://researchspace.csir.co.za PY - 2017 SM - 0008-6223 SM - 1873-3891 T1 - High-performance Mn3O4/onion-like carbon (OLC) nanohybrid pseudocapacitor: Unravelling the intrinsic properties of OLC against other carbon supports TI - High-performance Mn3O4/onion-like carbon (OLC) nanohybrid pseudocapacitor: Unravelling the intrinsic properties of OLC against other carbon supports UR - http://hdl.handle.net/10204/10861 ER -